The Herpetological Journal is the Society's prestigious quarterly scientific journal. Articles are listed in Biological Abstracts, Current Awareness in Biological Sciences,Current Contents, Science Citation Index, and Zoological Record.
Authors: Trevor J. C. Beebee
Abstract: The tolerances of spawn and tadpoles of the natterjack toad to varying degrees of acidity have been investigated. The results show that:
l . Spawn and small tadpoles are more vulnerable than large tadpoles to low pH.
2. Total mortality of spawn occurs below pH 4.0 with the critical range for survival being between pH 4. 0-4. 5.
3. Growth rates of tadpoles are increasingly inhibited by pHs between 6.0 and 4.0 even in the presence of excess food.
4. It takes more than 24 hours for spawn to be killed by exposure to low pH (3. 5).
5. Healthy spawn is less vulnerable to acid damage than spawn containing large numbers of dead eggs at the outset .